在swift中正确地对UITextField进行子类化 [英] Properly Subclassing UITextField in swift

问题描述

所以我有这些文本字段，我意识到它们都具有相同的属性，所以我创建了一个名为 UserInputs 的新类，并从 UITextField ，一切正常，除了一件事， UITextFieldDelegate 函数不起作用，我的意思是当我专注于它们它不起作用，我想在代码中添加它，因为当你专注于我的输入字段时，它们会改变边界，我如何从 UITextField

So i have these textfields that i realised that they all have same properties, so i created new class called "UserInputs" and extended from UITextField, everything works properly except one thing, UITextFieldDelegate functions doesn't work, i mean when i focus on them it doesn't work, i want to add it in code because when you focus on my input fields they change border, how do i properly subclass from UITextField

正确地继承子类的唯一问题我有这个功能：

the only problems that i have are that functions:

textFieldDidBeginEditing
textFieldDidEndEditing

因此不起作用。

这是我的类所有内容发生：

this is my class where everything happens:

import Foundation

import UIKit

class RegistrationViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var firstName: UserInputs!
@IBOutlet weak var test: UserInputs!

override func viewDidLoad() {
    super.viewDidLoad()
    self.firstName.delegate = self
    self.test.delegate = self
}

}

这是我的子类：

class UserInputs: UITextField{

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!
    createBorder()
}
func createBorder(){
    let border = CALayer()
    let width = CGFloat(2.0)
    border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor
    border.frame = CGRect(x: 0, y: self.frame.size.height-width, width: self.frame.size.width, height: self.frame.size.height)
    border.borderWidth = width
    self.layer.addSublayer(border)
    self.layer.masksToBounds = true
    //print("border created")
}
func textFieldDidBeginEditing() {
    print("focused")
    self.pulseBorderColor()
}
func textFieldDidEndEditing() {
    print("lost focus")
    self.reversePulseBorderColor()
}
func pulseBorderColor(){
    let pulseAnimation = CABasicAnimation(keyPath: "borderColor")
    pulseAnimation.duration = 0.35
    pulseAnimation.fromValue = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor
    pulseAnimation.toValue = UIColor(red: 252/255, green: 180/255, blue: 29/255, alpha: 1.0).CGColor
    pulseAnimation.fillMode = kCAFillModeForwards
    pulseAnimation.removedOnCompletion = false
    pulseAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
    self.layer.sublayers![0].addAnimation(pulseAnimation,forKey: nil)
    }
func reversePulseBorderColor(){
    let pulseAnimation = CABasicAnimation(keyPath: "borderColor")
    pulseAnimation.duration = 0.35
    pulseAnimation.fromValue = UIColor(red: 252/255, green: 180/255, blue: 29/255, alpha: 1.0).CGColor
    pulseAnimation.toValue = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor
    pulseAnimation.fillMode = kCAFillModeForwards
    pulseAnimation.removedOnCompletion = false
    pulseAnimation.timingFunction = CAMediaTimingFunction(name:  kCAMediaTimingFunctionEaseInEaseOut)
    self.layer.sublayers![0].addAnimation(pulseAnimation,forKey: nil)
    }
}

此代码有效当我没有子类并且在我的主类中进行它时，但是在创建子类后，焦点函数停止工作，其他一切正常工作

this code worked when i had no subclass and was doing it inside my main class, but after creating subclass focus functions stopped working, everything else works

主要问题是我要实现

func textFieldDidBeginEditing() {
    print("focused")
}

func textFieldDidEndEditing() {
    print("lost focus")
}

这些在我的文本区域中所以我不会一遍又一遍地写它

these in my textfields so i don't write it over and over again

推荐答案

它看起来像 UITextFieldDelegate 您的代码中的函数有点偏差。它们应该是：

It looks like the UITextFieldDelegate functions you have in your code are a little off. They should be:

func textFieldDidBeginEditing(textField: UITextField) {
    print("focused")
}
 func textFieldDidEndEditing(textField: UITextField) {
    print("lost focus")
}

由于您希望 UserInputs 对象成为他们自己的代理，我也添加了该代码。为了证明这一点，我有以下两个文件：

And since you want the UserInputs objects to be their own delegates, I've added that code, too. To demonstrate this, I have the following two files:

ViewController.swift

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    var textField: UserInputs!

    override func viewDidLoad() {
        super.viewDidLoad()
        textField = UserInputs(frame: CGRectMake(100, 100, 200, 40))
        view.addSubview(textField!)
    }
}

UserInputs.swift

import UIKit

class UserInputs: UITextField, UITextFieldDelegate {

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
        delegate = self
        createBorder()
    }
    required override init(frame: CGRect) {
        super.init(frame: frame)
        delegate = self
        createBorder()
    }
    func createBorder(){
        let border = CALayer()
        let width = CGFloat(2.0)
        border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor
        border.frame = CGRect(x: 0, y: self.frame.size.height-width, width: self.frame.size.width, height: self.frame.size.height)
        border.borderWidth = width
        self.layer.addSublayer(border)
        self.layer.masksToBounds = true
        //print("border created")
    }
    func textFieldDidBeginEditing(textField: UITextField) {
        print("focused")
    }
    func textFieldDidEndEditing(textField: UITextField) {
        print("lost focus")
    }
}

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